A 15-year-old girl presents two days after she had a head-to-head collision with another player during a soccer match. At that time, she lost consciousness for about two minutes. After regaining consciousness, her GCS was 15/15 and she was fully oriented. She was transported to the emergency department in a C-collar. No focal neurological signs were present. Non-contrast computed tomography of the head and neck was normal. She was discharged after a period of observation.

She now complains of a mild to moderate “pounding” headache that is worse in bright light and relieved by darkness. She also reports intermittent light-headedness, blurry vision, nausea, and emotional lability. There is no history of vomiting, loss of vision, or weakness, numbness, or tingling of her extremities. Her medical history is unremarkable. She is not on any medications. She denies consuming alcohol or using recreational drugs.